Download Calendar 2016 for Android
Very simple to use calendar displaying red days and events synchronized with your online calendars.
Experience the smooth navigation between the views month-day-event. Nice display with pastel colors on dark background. Moon phases are included.
Following is true for all calendar apps : to synchronize online calendars you need to enable synch at device level : System Settings > General > Accounts > Add account. Radio-button "Sync calendar" has to be checked. Moreover make sure global synchronization is enabled. Refer to provided screenshots.
Ads is unobtrusive, only in month view and there is a button 'No ads today'. You can remove ads permanently with menu option 'No ads'.